Pump



PUMP

Filed May 9, 1924 Patented Aug. 30, 1927.

UNITED STATES PATENT OFFICE.

HUGH WALLACE, OF DAYTON, OHIO,` ASSIGNOR TO GENERAL MOTORS RESEARCH COR- PORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

PUMP.

Application filed May 9, 1924. Serial No. 712,165.

This invention relates to improvements in electromagnetic motors and more particle larly to that type of motor utilized for operating fluidfmoving devices.

It is among the objects of the present invention to provide a motor of simple structure and design'makinga very compact and eflicient unit.

Further objects and advantages of the present invention will be apparent from the following description, reference being made to the accompanying drawings, wherein a preferred form of embodiment of the pres-` ent invention is clearly shown.

In the drawings:

Fig. 1 is a longitudinal cross section of the motor unit combined with a fluid pump, and taken along the line 1 1 of Fig. 2.

Fig. 2 is a sectional view taken along the line'2-2 of Fig. 1.

Fig. 3 is a detail fragmentary view of the circuit interrupter mechanism.

Fig. 4 is a detail end view of the interrupter electromagnet.

Fig. 5 is a diagrammatic view of the pulmping device showing the electrical connections thereof.

Referring to the drawings: The pumping device comprises a guide or cylinder 2() made up of any suitable non-magnetic material. A nipple cap 21 is screwed into one end of `thecylinder 20 having the leak-proof gasket 22 interposed between itself and the cylinder.

A longitudinal passage 23 is provided in the nipple cap, which communicates with the inside of the cylinder. p

Within the cylinder there is provided a reciprocative element or piston 24 made up of any suitable magnetic material. The piston has'a central longitudinal passage 25 having its one end; funnel shaped as at 26 while a countersunk portion at the opposite end of the passage receives the valve seat plate 27. Valve 28 is associated with this-valve sea't plate7 the valve being held in position by means of cage 29 which is secured to the' valve seat plate 27 by means of angular portions which extend into a groove formed in the valve seat plate..

Secured to and surrounding la'. portion of.

the cylinder 20 is the magnet winding 30 which is provided at each end with insulating plates 31. A magnetic shell or casing 32 surrounds the winding 30, the one end of said casing extending beyond the insulating end cover 31 of the coil while the opposite end of said casing hasan outwardly extending fiange portion 33 to which is secured the `inder opposite the nipple cap 21, said core having its interior end cone shaped as at 37 to correspond with the formation of the end of the piston 24. `This inner end of the core has two slots 38 arranged at right angles with each other, said slots communicating with a longitudinal passage 39 formed in the core.- A flange 40 on the core, abuts against the end of the cylinder 20. A valve seat plug 42 screws into the `outer end of the passage 39 of core 36, said plug having a l -longitudinal passage 43. At the upper end of this passage the valve 44is provided having a retaining cage 45 similar to the one associated with the valve y28. .Transverse passage 46 forms communication between the longitudinal passage 43 and the outside of the plug 42.

Fitting inside the inner end of the casing 32 and secured thereto by means of screws 47 is a housing 48 which has a portion 49 encompassing the flange 4() of the core 36 in such a., manner as to hold said core securely in position in the cylinder 20. The numeral 41 designates a soldered connection between the cylinder 20, the core flange 40 and the portion 49 of the housing 48, thus providing a leak-proof joint at .the point. The lower end of this housing 48 is apertured and screw-threaded to receive' a nipple plug 5() which is provided with a longitudinal passage y51 communicating with theI inside of the housing 48. A spider 52 is carried on the interior side of the plug 50, said spider forming an anchoring means for the fluid ,filtering screen 53,*the. opposite end of which fits about an enlarged portion of the plug 42. 1 The core 36 is provided at its inner end with a shoulder portion against which one end of the spring 55 abuts. The opposite end of this spring rests or abut's against the valve seat plate 27.

From the vforegoing it may be seen that the various elements so described will function as follows: When the coil or winding 30 is energized by being brought into circuit connection with the source of electrical energy shown 1n the present inst-ance to be a `storage battery designated by the numeral 100, a .magnetic circuit will be created through the following path. through the cas ing 32, metal end. cover 34, through the nonmagnetic cylinder into the magnetic piston 24, across the'gap between the end of the piston and the core 36, thence through housing 48 back to the casing 32. This will cause the piston 24 to be attracted and `moved toward the core 36 against the effect of the spring 55 to hold the piston in norma1`po--' sition. Any fiuid within the passage 25 ofl `the spring 55 will be permitted to move the piston back to its normal upper position. his will cause the valve 28 to be closed and create 'a suction within the cylinder 20 thus opening the valve 44 and permitting fluid to flow from the source of supply not shown, but in connection with the plug 50. this fluid owing through the channel 51, through spider 52, into the space between the housing 48 and filtering screen 53, then through said filtering screen, transverse passages 46, into passage 43 past the valve 44 into the cylinder 20.

To intermittently obtain the above-described operation of the motor, there is 'provided a circuit interrupting device for controlling the operation of the magnet winding or more specifically for making and breaking the circuit between the source of electrical energy 100 and this winding 30. The circuit interrupting device comprises a magnet winding 60 having a core 61, both ends being bifurcated, the plate 62 fitting into the one bifurcated end of the core while the plate-63 fits into the other bifurcated end. TheV plate 62 forms one pole for the electromagnet Winding 60, the end of said pole having a circular shaped surface which extends into a slot cut in the cylinder 20, the inner cylindrical shaped surface of said pole being concentric with but slightly larger than the inner surface of the cylinder. A pair of magnetic posts 64 are secured to this plate or pole piece 62, said 4osts carrying a second pole shoe 65 which is also provided with a pole face similar in sha e to `the pole face of the plate 62, the pole ace of the late orv shoe 65 also,` extending into a slot in the cylinder, the inner surface of said pole face corresponding to the inner surface of the pole piece 62. Directly opposite the two pple shoes 62 and 65 there are rovided two single pole Shoes 66 and 67, t e inner pole faces thereof also extending into slots in the cylinder and their inner faces being likewise slightly greater in diameter than the inner surface of said cylinder. All of these pole shoes may be secured to the cylinder in any suitable manner preferably by soldering.

Referring to Fig. 3 the plate 63 is shown mounted on and secured toa post 70 which is secured to the plate 34 in any suitable manner. A plate spring 71 is secured to the plate 63v by means of screws 72, which also hold 'the plate 63 in position on the post 70. This plate spring carries and has secured thereto, the armature or movable contact arm 73. The freeend of this contact arm extends between the pole shoes 66 and 67, the arm normally being held adjacent the pole shoe 67. Inthisposition the contact 74 carried by the arm 73 engages with the stationary contact 75 which is adjustably carried onthe late 76 which in turn is mounted Von butinsulated from the post 77. A conducting strip 78 is held in circuit-making relation with the plate76 by means of screw 79. This conducting strip 78 has one end. of the winding 30 connected thereto, the opposite end of said winding being connected with 'conducting strip 8O which is provided with terminal 81 to which are connected one side of the battery 100 and'one end of 'piston is shown having a circumferential groove 85 so positioned on the piston and of such a size, that, when the piston is in its Y normal upper position as shown in the figure, the main body portion of said piston will lie within. the pathbetween pole shoes 62 and 67, thus the groove 85 will lie ineffectivey as regards the reluctance of this path. The upper magnetic path, however, between pole shoes 65 and 66 will have the roove therebetween, providing reluctance 1n this latter path. However, when the piston is moved downwardly as has been mentioned heretofore, the groove 85 will be moved into the magnetic' path between shoes 62 and 67, thereby providing magnetic reluctance in this path while at the same time` the body portion of the piston will be moved into the path between the pole shoes 65 and 66 reducing the reluctance through this latter path.

By referring to Fig. 5 the circuit connection Vof the various elements may be ob served.

When it is desired to operate the pump the main switch 99 is closed, thereby per- 4 mitting current to flow from the battery 100 through two circuits; in the first the current w1ll flow from the terminal 81,/through lconducting plate 80, through the winding 30,

conducting plate 78, plate 76, stationary contact 75, movable contact 74, movable contact arm 7 3, plate spring 71, to the grounding terminal 72, thence through the rground connection back to the battery. In the second circuit, current will flow from the terminal 8l, through the wire 98, winding 60, to the grounding terminal 72,' thence to the ground connections back to the battery.

Current flowing through the winding will, as has been mentioned before, cause the attraction of the piston 24 by the core 36 thus moving the piston downwardly toward the core against the opposition of the spring 55. The main body of the piston will move from between the pole shoes 62 and 67 thereby introducing magnetic reluctance in this path by interposing Vthe circumferential groove 85. In the path between the pole shoes 65 and 66 however, the magnetic re-l luctance will be substantially removed by the moving of the body portion of the piston into this path, thus the magnetic iiuX passing through the corev 61 of the winding 60 due to.

the latter being energized will cause the n -movable contact arm 73 to be attracted by the pole shoes 66 and move adjacent this pole shoe against the opposition ofthe plate 71', thus moving the contact 74 out of engagement with the contact 75 and breaking the circuit through the winding 30. De-energization of the core 36 will now be eii'ected and the spring will again return the piston to its normal upperV position whereA reluctance will be provided in the path of the pole shoes and 66 and removed from the palth of the pole shoes 62 and 67. This will cause energization of the pole shoe 67 and de-energization of the pole shoe 66, thereby permitting the plate spring 71 to again return the movable contact arm 73 intov the normal contact-engaging position where the circuit through the winding 3() will again be establishe Intermittent operation of the piston 24 as described will cause fluid to be drawn from the main fluid supply tank not shown, and cause delivery of this Huid to any suitable work device connected with the nipple cap 21, the Work device not being shown in the present drawings.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming` within the scope of the claims which follow. f

lV hat I claim is as follows:

n l. An electromagnetic motor comprising, in combination, a; guide; a lreeiprocative member in 'the' guide; an electromagnet coil for operating the reciprocative member; a

second electromagnet including a winding and a plurality of pole pieces providing a divided magnetic circuit; a movable armature associated-with the second electromagnet and adapted-to be moved from one to the other of said pole pieces; a circuit inter-- ruptei1 in circuit with the reciprocative member operating coil, and operable by the movement of the said armature to control the energization ofthe said coil; andmeans provided oii the said member to vary the magnetic circuit from one to the other of said pole pieces whereby to operate the interrupteroperating armature. l

2. Anelectromagnetic motor comprising in combination, a guide member; an electromagnet coil about said guide; a second electromagnet coil including a core having a plurality of spaced pole pieces providing a divided magnetic circuit; a movable armature adapted to be moved from one to the other of said pole pieces; circuit interruptfing means controlled by the movable armature and in turn controlling the operation of t-he electromagnet coil about the guide; and 'a magnetic reciprocating memberfin said guide, operated by the said electromagnet coil, said reciprocating member having an annular recess providing a gap adapted to be moved into the magnetic circuit of either of the spaced pole pieces, to interrupt the magnetic How across the `respective pole pieces.

3. An electromagnetic motor comprising, in combination, a -guide;-a reciprocative member in the guide; an electromagnet winding for operating said member; circuit interrupting means for controlling the energization of the electromagnet winding; and a second electromagnet including a plurality of magnetic circuits and an armature mechanically disconnected from the reciprocative member,4 but controlled by said member to operate the circuit interrupting means.

4. An electromagnetic motor comprising, in combination, a guide; a magnetic, reciprocative member in the guide; an electrol magnet winding surrounding said guide and adapted to operate the said member; 'circuit interrupting means for controlling the energization of the reciprocative member operating winding; and a second electromagnet including a winding and a plurality of 4magnetic circuits, and adapted, under the .control of the said member, to control the operation of the circuit interrupting means.

5. An electromagnetic motor comprising, in combination, a guide; a magnetic, reciprocative member in the guide; anl electromagnet winding surrounding said guide and adapted to operate ,the said member; circuit interrupting kmeans including a movable magnetic 'memberfor controlling the energization of the reciprocative member operating winding; and a second electromagnet comprising a winding and two magnetic circuits alternately brought into eiect by the operation of the reciprocative member to attract the movable magnetic member of the circuit interrupting means.

6. 1in-electromagnetic motor comprising,

. in combination, a guide; a magnetic, reciprocative member in the guide; an electromagnet 'Winding surrounding said guide and adapted to operate the said member; circuit interrupting means for controlling the energizat-ion of the reciprocative member` operating winding; said means including a Stationary and movable Contact arm; a source of electrical energy in circuit With the reciprocative member operating Winding and the circuit interrupter; and a second clectromagnet having a winding and a magnetic circuit which inclu-des the movable contact arm of the circuit interrupter as one pole piece and a two-part pole shoe, with the movable pole piece therebetween, as the opposite pole piece, said magnetic circuit being so arranged relative to the guide, that the moving of the said member in said guide Will shift the magnetic circuit alternately from one of the two pole shoes to the other, thereby causing the operation of the circuit interrupter.

7 An electromagnetic motor comprising, in combination, a source lof electrical energy; a cylindrical guide; a magnetic, reciprocative member in the guide; an .electromagnet winding associated with the guide and adapted to operate the said member; a secon-d'l electromagnet including' a Winding and a 'magnetic circuit comprising a single movable pole piece and adouble pole piece carried on the cylindrical guide; and a circuit controlling device adapted lto control the energization of the rec1proca,

tive member operating Winding and' including a stationary and a movable contact, the latter being carried by the. movable pole piece and operable into contact engaging and disengaging position. by movement of 'the reciprocative member.

In testimony vwhereof I hereto affix my signature.

HUGH WALLACE. 

